walker



.(No Model.) 3 Sheets-Sheet 1-.

J. "WALKER. GEAR MOLDING MAGHINB. No. 250,811. Patented Nov. 29,1881.

PIECE- N. PETERS. Pmlo-Lnha m her. \Vashmglun. D. c.

(N0 Modem 3 Sheets-Sheet 2.

J. WALKER.

GEAR MOLDING MACHINE.

No. 250,311. Patented N0v.29,1881.

u. PETERS. Photo-lithographs. Wuihinglon. n. c.

(No Mod'el.) 3 Sheets-Sheet 3.

J. WALKER.

GEAR MOLDING MAGHINE.

N0. 250,311. Patented N0v..29,1881

ZZZ/M a u. PETERS. PhaXo-Lullogmpher. Wnshmghm. 11c

. UNITED STATES PATENT Orrrcn.

JOHN WALKER, OF INDIANAPOLIS, INDIANA.

'GEARV-MOLDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 250,311, dated November 29, 1881,

Application filed August 27, 1881.

To all whom it may concern:

Be it known that 1, JOHN WALKER, of Indianapolis, in the county of Marion and State of Indiana, have invented certain Improve ments in Gear-Molding Machines, of which the following is a specification.

This invention relates to certain novel features in the construction of a gear-molding machine, as will hereinafter appear.

In the description of my invention which follows, reference is made to the accompanying drawings, forming a part thereof, and in which Figure I is a partly sectional elevation of the improved machine. Fig. IIis a plan of a portion of the machine. Figs. III, IV, V, VI, VII, VIII, IX, X, XI, XII, and XIII are views of details of the invention on an enlarged scale.

Similar letters of reference indicate similar parts in all the views.

A is the bed-piece ot' the machine, which consists of three concentric rims, a, b, and 0, connected by radial arms The upper surfaces of the said rims are turned or faced, the inner one, a, to receive the lowerend ofa cylinder, B, and the others, b and c, the dividing-rings GandD. Thedividing-ringsOandDhaveeach a toothed outer circumference, and their upper edges are adapted as tracks or rails b, for the wheels 6 of a truck,f, to run on.

E is the center piece of the machine, constructed to support a central spindle, around which the movable parts of the machine are revolved. The said center piece is adapted to rest on either the upper face of the cylinder B, or, when the cylinder B is removed, on the central-rim of the bed-piece. The center piece is shown in the latter position in dotted lines, Fig. I.

F F are face-plates, which may be used to support a flask in the gear-molding operation. Gears may, however, be molded in a pit formed by the dividing-rings O and D instead of on the face-plates, as before described. It the diameter of the gear to be made in the pit is about equal to that of the inner dividingring, O, this ring is removed, also the cylinder B, and the center piece, E, lowered to the bedpiece A of the machine, as shown in dotted lines, Fig. I. Should, however, the gear to be constructed in the pit correspond in diameter (No model.)

with the larger rim D, this outer ring is removed and the inner one, C, retained in position until the teeth-depressions are formed in the sand. After the completion of this part of the molding operation, the inner dividingring, G, is also removed to admit of the formation of the arms of the gear.

From the foregoing description it will be understood that gears can be molded either in flasks situated on the face-plates, which are about on a line with the floor, or within a pit which is variable in diameter, in view of the dividing-rings being removable.

The center piece, E, of the machine has double cone-bearings for the central spindle, G. The said spindle is therefore self-centering, and is held rigidly in place without the aid of any other securing devices.

H is a horizontal bar connecting the spindle G, around which it may be revolved, with the truck f, and it carries the vertical bar H, to which the tooth-block g is secured. The horizontal bar H, enlarged views of which are shown in Figs. III and V, has a rack, h, and the vertical bar H is provided with a pinion, h, in gear therewith. This .pinion, which is shown in dotted lines only in Figs. I and III, is revolved through the medium ofahandle, t. The vertical bar H, which is confined in the guide H, as before stated, is slid therein by means of a rack, 70, pinion 7c, Worm-wheel 7c", worm l, and hand-wheel Z. This mechanism is shown on an enlarged scalein Figs. III and IV of the drawings. .A stop, m, is used to limit the downward movement of the toothblock, and thereby produce a true face in the gear.

By reference to Fig. V of the drawings it will be seen that the wheels eof the truck f 0 can therefore be moved radially to either of the dividing-rings. In Fig. V the horizontal bar H is turned slightly out of its proper position, in order that a right-angular cross-section of the same may be shown. This arrangement of the parts prevents .to some ex tent the proper idea of the relation which the said bar bears to the truck. Special attention is therefore called to Figs. I and II, in which the flange of the upper end of the truck, which is designated byf, is shown as united to the under side of the said horizontal bar.

I is a dividing-disk, (shown on an enlarged scale in Figs. V and VI,) notched to receive a spring-handle, I; and I" is a train of changegearing, which communicates motion from the spring-handle I to the dividing-gearing I, and thence to the beveled gears a and n. The beveled gear a is fastened to a shaft, 11/, to which the dividing-pinion I, in gear with the teeth on the dividing-ring, is secured. These devices are shown on an enlarged scale in Fig. V.

K is a sleeve bolted. to the truckf, in which an eccentric bush, K, is adapted to turn. The shaft a extends through the eccentric bush, and upon turning the bush K by means of a handle, which is inserted in a slot, 11 in a flange, n, forming a part of the said bush, the dividing-pinion is thrown in and out of gear with the teeth on the dividing-ring. The flange n is provided with a spring-bolt, 1', having a collar, 1', adapted to fit in recesses r" in the flange r of the sleeve K, to secure the eccentric bush K when the same is set. (See Figs. V and VIII.) The truck with its attendant mechanism can be moved rapidly around the dividing-rings, when desired, by means of the hand-wheel K.

L L are annular guard-plates to protect the teeth of the dividing-rings and the dividingpinion I from sand. These guard-plates are shown only in Fig. I of the drawings.

M M, Fig. I, are floor-plates, in sections, the latter one of which plates is removed when the inner dividing-ring is used in spacing the teeth-depressions in the molding operation.

The face-plates F F (see Figs. IX, X, and XI) have annular grooves 0, into which the lower edges of rings 1) are placed, to level, center, and support the flask 0.

By referring to Figs. I and II it will be seen that the horizontal bar is provided with a contractible clamp, P, where it connects with the central spindle, G, which admits of compensation for wear.

To allow of gears being made either upon the face-plates or in the pit formed by the dividing rings two spindles, G, of different lengths, as shown by dotted lines, Fig. I, are used.

After the preparation of the sand-bed, by

means of a strike the tooth-depressions are formed by ramming sand against the toothblock, as is usual, the said tooth-block after each ramming operation being elevated and moved around or circumferentially the proper distance.

The tooth-block is preferably constructed to the shaft to which the dividing-disk is secured,

and through which motion is communicated to the change gearing, is provided with a feather which admits of the operation of the change-gearing when the truck is connected with either of the dividing-rings, and also that the said shaft passes through aball-socket, to allow of the change in angle of the shaft in the adjustment of the truck.

I claim as my invention 1. In a gear-molding machine, a stationary bed-piece supporting a central spindle, a horizontal bar adapted to turn about the said spindle carrying adjustable supporting devices for a tooth-block, a wheeled truck and a rail or track for the same to-support the outer end of the said arm, and suitable gearing for adjusting the circumferential movement of the said truck and arm, substantially as specified.

2. In a gear-molding machine, a stationary bed-piece having a removable central cylinder supporting a removable center-piece for a spindle, removable concentric dividing-rings, a series of removable face-plates adapted to sustain, center, and level a flask, and mechanism for adjusting and circumferentiallymoving a supported tooth-block, substantially as specified.

3. In a gear-molding machine, the face-plate thereof provided with a series of central concentric grooves, and rings adapted to fit into said grooves to support, center, and level a flask, substantially as specified.

4. In a gear-molding machine, a wheeled truck supporting the outer end of a circumferentially-moving arm carrying a tooth-block and a dividing pinion, a toothed dividin g-rin g, and mechanism for throwing the said pinion in and out of gear with the said dividing-ring, substantially as and for the purpose specified.

JOHN WALKER.

Witnesses:

J NO. T. IVIADDOX, WM. S. HOWARD. 

